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x in (-oo:+oo)
(7/2)*x = 4/3 // - 4/3
(7/2)*x-(4/3) = 0
(7/2)*x-4/3 = 0
7/2*x-4/3 = 0 // + 4/3
7/2*x = 4/3 // : 7/2
x = 4/3/7/2
x = 8/21
x = 8/21
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